User authentication mechanisms in Operating Systems - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is user authentication in operating systems?

User authentication is the process of verifying the identity of a user before granting access to the system or resources.

beginner

Name three common types of user authentication mechanisms.

The three common types are: 1) Something you know (passwords, PINs), 2) Something you have (security tokens, smart cards), 3) Something you are (biometrics like fingerprints or facial recognition).

intermediate

What is two-factor authentication (2FA)?

Two-factor authentication requires users to provide two different types of authentication factors, such as a password plus a code sent to their phone, to increase security.

beginner

Why are passwords alone often not enough for secure authentication?

Passwords can be guessed, stolen, or cracked. They may be weak or reused, making systems vulnerable to unauthorized access.

intermediate

What role do biometrics play in user authentication?

Biometrics use unique physical traits like fingerprints or facial features to verify identity, providing a convenient and hard-to-forge authentication method.

Which of the following is NOT a common authentication factor?

A Something you want

B Something you have

C Something you know

D Something you are

Authentication factors include something you know, have, or are. 'Something you want' is not an authentication factor.

What does two-factor authentication (2FA) improve?

A Security by requiring two different authentication methods

B User convenience

C System speed

D Password complexity

2FA improves security by requiring two different types of authentication factors.

Which authentication method uses fingerprints?

A Password

B Token

C Biometrics

D PIN

Biometrics use physical traits like fingerprints for authentication.

Why might passwords alone be insecure?

A They are biometric data

B They are always too long

C They require special hardware

D They can be guessed or stolen

Passwords can be guessed, stolen, or cracked, making them less secure alone.

Which of these is an example of 'something you have' authentication?

A Fingerprint

B Security token

C Password

D Retina scan

'Something you have' includes items like security tokens or smart cards.

Explain the three main types of user authentication factors with examples.

Think about what you remember, what you carry, and what you physically are.

Describe why combining multiple authentication factors improves security.

Consider how layers of security work together.